/**
 * @Author : SL
 * @Date : 2019/5/29
 * @Version :1.0
 * @Last Modified by : SL
 * @Last Modified time : 2019/5/29
 **/
function add(a, b) {
    return a + b
}
function mul(a, b) {
    return a*b
}
module.exports={add,mul}